EP0816691A2 - Sperrventil mit Druckbegrenzung - Google Patents
Sperrventil mit Druckbegrenzung Download PDFInfo
- Publication number
- EP0816691A2 EP0816691A2 EP97109617A EP97109617A EP0816691A2 EP 0816691 A2 EP0816691 A2 EP 0816691A2 EP 97109617 A EP97109617 A EP 97109617A EP 97109617 A EP97109617 A EP 97109617A EP 0816691 A2 EP0816691 A2 EP 0816691A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- check valve
- valve body
- consumer
- stop valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/01—Locking-valves or other detent i.e. load-holding devices
- F15B13/015—Locking-valves or other detent i.e. load-holding devices using an enclosed pilot flow valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20538—Type of pump constant capacity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30505—Non-return valves, i.e. check valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3105—Neutral or centre positions
- F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/32—Directional control characterised by the type of actuation
- F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/35—Directional control combined with flow control
- F15B2211/353—Flow control by regulating means in return line, i.e. meter-out control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50563—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure
- F15B2211/50581—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure using counterbalance valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5153—Pressure control characterised by the connections of the pressure control means in the circuit being connected to an output member and a directional control valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7051—Linear output members
- F15B2211/7053—Double-acting output members
Definitions
- the invention relates to a check valve according to the preamble of claim 1, which in at least one consumer channel a directional valve equipped with a longitudinal slide and blocks in the backflow direction.
- the consumer channel this is the longitudinal slide in the direction of Consumer's subsequent bore and channel system in the valve housing and in the line connection.
- Some of the known directional control valves also contain such Check valves in the area of the respective consumer connections are arranged.
- the check valves have the Task of leakage through the directional valve on the consumer side, to which they are attached or integrated, so low to keep as possible. Once these check valves are under pressure
- the backflow direction is Direction of the pressure medium flow from the consumer via the corresponding one Valve in the tank.
- the pressure relief valve opens the sealed off by the check valve leading to the consumer Pressure medium line as soon as the pressure there is the required Working pressure exceeded by a preset amount Has.
- This here when relieving the pressure medium line Released pressure medium is within the directional control valve contains the check valve with the pressure relief valve in the regular return directed.
- the pressure relief valve closes before the pressure in the pressure medium line on the consumer side has reached the required working pressure.
- the Pressure relief valve is set so that the required Working pressure is not fallen below.
- the arrangement of the pressure relief valve in the body of the check valve opens the possibility of using directional valves with a Check valve are equipped without pressure limitation and the have overpressure problems described here, afterwards with to convert the new check valves with pressure limitation.
- Figure 1 shows a section of a directional valve (10) in Longitudinal section.
- the paths of the pressure medium are partially recognizable between a pump (1), a consumer (5) and a tank (2).
- the consumer (5) is here according to FIG. 2, for example a double-acting cylinder-piston unit, whose Piston is loaded with a load (L).
- the hydraulic circuit diagram shown in Figure 2 shows as a directional control valve (10) with a mechanically operated 6/3-way valve compression-centered center position.
- the pump (1) supplies on the one hand via a check valve (3) and an inlet connection (P) a working connection (A) and the other one Neutral circulation (N) or a work connection (B).
- the work connections (A) and (B) are in one depending on the valve position Return port (R) unloaded.
- In the middle position of the directional valve (10) is between the working port (B) and the return port (R) switched a throttle valve (36).
- the consumer lines are at the working connections (A) and (B) (6) and (7) connected via which the cylinder-piston unit (5) is supplied.
- Figure 1 is the valve area shown, the pressure medium between part of the Neutral circulation, part of the return and the work connection (B) or a consumer connection (25) flows through.
- the valve housing cutout (11) has a through hole (12), in which a longitudinal slide (30) is guided. Of the Longitudinal slide (30) is at its free, right end Tab (31) formed with a bore through which it, for example articulated mechanically by means of a lever mechanism becomes.
- the lever gear not shown, enables, among other things. an anti-rotation device for the longitudinal slide (30).
- the left channel is a neutral circulation channel (13) by the pump (1) via a Inlet line (14) is fed.
- the second channel from the left is an intermediate channel (15).
- the third channel from the left is an intermediate chamber (16), which is arranged by an over it Check valve (40) with a consumer connection (25) hydraulic communicates.
- the right channel is the return channel (17) via a return line (18) into the tank (2) flows.
- the longitudinal slide (30) shown in the neutral position has Area between the intermediate channel (15) and the intermediate chamber (16) a constriction (32), which is on the left side a regionally conical button (34) approximately expanded the diameter of the through hole (12).
- a constriction 32
- a regionally conical button 314
- the recesses (35) ensure when opening the hydraulic connection between the neutral circulation channel (13) and the intermediate chamber (16) - ie when the Longitudinal slide (30) to the left - between the channels (13) and (15) a relatively large, free flow cross-section.
- an unlocking plunger (65) is mounted for longitudinal displacement. Above the upper end of the unlocking plunger (65) is a Check valve (40) arranged.
- the check valve (40) has a check valve body (41) which in a check valve bore (21), in the locked state with its conical seat on a check valve seat (22) lies on.
- the check valve body (41) is via a spring element (58), which is screwed on, for example, here Supporting plate (56) supported, pressed against the seat.
- the one Internally threaded bore of the consumer connection (25) has at least two uniform ones in the area of the holding plate (56) Recesses (26), which in some areas are outside
- the Holding plate (56) has a plurality of bores (57) which flow through allow the holding plate (56).
- the check valve body (41) has one in its upper region downward tapered outer contour that the seat represents. At the bottom is the seat a valve body (51). The latter has a core area around the three radially projecting, rib-like guide webs (52-54) are arranged, the check valve body (41) in the check valve bore (21). Between the boardwalks (52-54) and the check valve bore (21) the primary flows Pressure medium flow with the shut-off valve (40) open.
- auxiliary check valve (60) In the core area of the check valve body (41) is an auxiliary check valve (60) arranged, cf. also Figure 3.
- the blocking direction of the auxiliary check valve (60) corresponds to that of the check valve (40).
- An auxiliary valve body (61) in a double stepped auxiliary valve bore (42) is arranged, including loaded by a spring element (63) an auxiliary bore (43) closed. The free upper one protrudes into the auxiliary bore (43) End of the unlocking plunger (65).
- At the bottom of the Valve body shaft (51) is a milled, after open transverse channel (55) at the bottom, which the auxiliary bore (43) cuts.
- the spring element (63) is supported on a disc (62) a central hole.
- the disc (62) is in turn by holding the check valve body (41) in the closed position Spring element (58) on the first paragraph of the auxiliary valve bore (42) depressed.
- a pressure relief valve (70) arranged against the Blocking direction of the check valve (40) or the auxiliary valve (60) opens.
- On the heel to the seat bore (46) is with the pressure relief valve closed (70) the valve body (71).
- the latter consists of one Carrier element (72) in which a valve ball (73) is inserted is.
- a coil spring seat is arranged on the carrier element (72), whose shaft is opposite to the closing direction of the Valve (70) tapers.
- the valve body (71) in the closing direction loading spring element (75) is supported by the Thrust washer (76) on one in the bottom of the check valve body (41) screwed in adjusting screw (77).
- the adjusting screw (77) is a standard set screw with Hexagon socket.
- valve bore (45) Located across the valve bore (45), approximately halfway through the bore there is a transverse bore (48) in the guide web (52). After at the top there is an inflow bore at the seat bore (46) (47). It ends in the seating area of the spring element (58).
- the pressure relief valve (70) is set so that it opens, for example, at a pressure which is 50 * 10 5 Pa above the regular working pressure.
- the pressure medium flows through the inflow bore (47), the seat bore (46), the valve bore (45) and the transverse bore (48) into the intermediate chamber (16). From there, the pressure medium flows in a known manner via the leakage gap (36) into the return channel (17) and back into the tank (2).
- the pressure relief valve (70) closes again.
- the pressure in the consumer line (7) is still above the regular working pressure.
- the circuit diagram of the pressure relief valve (70) in combination Figure 2 shows the auxiliary shutoff valve (60).
- the installation location and type of installation of the pressure relief valve (70) has the advantages of being before the consumer flowing pressure medium flow is protected and the check valve function of the check valve (40) is not affected becomes.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Check Valves (AREA)
- Bag Frames (AREA)
Abstract
Description
- Figur 1:
- Längsschnitt durch einen Teilbereich eines Wegeventils,
- Figur 2:
- Hydraulikschaltplan eines Wegeventils mit nachgeschaltetem Sperrventilkörper,
- Figur 3:
- Unteransicht und Längsschnitt des Sperrventilkörpers.
Claims (9)
- Sperrventil, das in mindestens einem Verbraucherkanal eines mit einem Längsschieber ausgestatteten Wegeventils angeordnet ist und in Rückströmrichtung sperrt, in dessen Sperrventilkörper ein ebenfalls in Rückströmrichtung sperrendes Hilfsventil sitzt, das zur Einleitung der verbraucherseitigen Verbraucherkanalentlastung über einen vom Längsschieber betätigten Stößel geöffnet wird,
dadurch gekennzeichnet,
daß in oder am Sperrventilkörper (41) ein Druckbegrenzungsventil (70) angeordnet ist, das in Rückströmrichtung (9) öffnet. - Sperrventil gemäß Anspruch 1, dadurch gekennzeichnet, daß es innerhalb des Wegeventilgehäuses (11) im Bereich eines Verbraucheranschlusses (25) angeordnet ist.
- Sperrventil gemäß Anspruch 1, dadurch gekennzeichnet, daß das Druckbegrenzungsventil (70) innerhalb des Sperrventilkörpers (41) parallel neben dem Hilfsventil (60) angeordnet ist.
- Sperrventil gemäß Anspruch 1, dadurch gekennzeichnet, daß das Druckbegrenzungsventil (70) innerhalb des Sperrventilkörpers (41) als zusätzliche Bauteile mindestens einen Ventilkörper (71), ein mechanisches Federelement (75) und eine diese vorspannende Druckbegrenzungsschraube (76) umfaßt.
- Sperrventil gemäß Anspruch 4, dadurch gekennzeichnet, daß die Druckbegrenzungsschraube (76) gegen Verdrehen fixierbar ist.
- Sperrventil gemäß einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß es als Sitzventil ausgebildet ist.
- Sperrventil gemäß einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Sperrventilkörper (41) einen auf einem Sperrventilsitz (22) aufliegenden Ventilkegel aufweist, an dem radial zu seiner (41) Längsachse verlaufende Führungsstege (52-54) angeordnet sind.
- Sperrventil gemäß Anspruch 7, dadurch gekennzeichnet, daß einer der Führungsstege (52) - in Umfangsrichtung gesehen - breiter als die anderen Führungsstege (53, 54) ausgebildet ist und die Ventilbohrung (45) für das Druckbegrenzungsventil (70) aufnimmt.
- Sperrventil gemäß Anspruch 8, dadurch gekennzeichnet, daß die Sitzbohrung (46) des Druckbegrenzungsventils (70) im Sperrventilkörper (41) liegt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19627306A DE19627306A1 (de) | 1996-07-06 | 1996-07-06 | Sperrventil mit Druckbegrenzung |
DE19627306 | 1996-07-06 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0816691A2 true EP0816691A2 (de) | 1998-01-07 |
EP0816691A3 EP0816691A3 (de) | 1999-03-17 |
EP0816691B1 EP0816691B1 (de) | 2002-12-18 |
Family
ID=7799133
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97109617A Expired - Lifetime EP0816691B1 (de) | 1996-07-06 | 1997-06-13 | Sperrventil mit Druckbegrenzung |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0816691B1 (de) |
DE (2) | DE19627306A1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1063431A1 (de) * | 1999-06-24 | 2000-12-27 | HEILMEIER & WEINLEIN Fabrik für Oel-Hydraulik GmbH & Co. KG | Hydraulisches Lasthalteventil |
WO2013043137A1 (en) * | 2011-09-23 | 2013-03-28 | Hema Endüstri Anonim Şirketi | Hydraulic lift control system |
EP2280179A3 (de) * | 2009-07-27 | 2013-11-13 | Robert Bosch GmbH | Wegeventilanordnung |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19953188A1 (de) * | 1999-11-05 | 2001-05-10 | Bosch Gmbh Robert | Hydraulische Ventilanordnung mit zumindest einem Sperrventil |
DE502004005325D1 (de) | 2003-04-10 | 2007-12-06 | Bosch Rexroth Ag | Stetig verstellbares wegeventil |
DE10325294A1 (de) | 2003-06-04 | 2004-12-23 | Bosch Rexroth Ag | Hydraulische Steueranordnung |
DE102009019907A1 (de) | 2009-05-04 | 2010-11-11 | Robert Bosch Gmbh | Sperrventil |
DE102018221288A1 (de) | 2018-01-04 | 2019-07-04 | Robert Bosch Gmbh | Ventilanordnung, Arbeitsmaschine und Verfahren zum Steuern einer Ventilanordnung |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3216448A (en) * | 1963-02-25 | 1965-11-09 | Parker Hannifin Corp | Spool valve assembly |
DE2559029A1 (de) * | 1975-12-29 | 1977-07-07 | Heilmeier & Weinlein | Bremsventil |
DE3048746A1 (de) * | 1980-12-23 | 1982-07-22 | Robert Bosch Gmbh, 7000 Stuttgart | Hydraulikanlage |
DE3305282A1 (de) * | 1982-02-18 | 1983-08-25 | Atlas Copco AB, Nacka | Lasthalteventil oder overcenterventil fuer hydraulische anlagen |
EP0466582A1 (de) * | 1990-07-13 | 1992-01-15 | Kabushiki Kaisha Kosmek | Hydraulische Schaltung zum Heben und Senken und Ventilblock für diese Schaltung |
-
1996
- 1996-07-06 DE DE19627306A patent/DE19627306A1/de not_active Withdrawn
-
1997
- 1997-06-13 DE DE59708982T patent/DE59708982D1/de not_active Expired - Lifetime
- 1997-06-13 EP EP97109617A patent/EP0816691B1/de not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3216448A (en) * | 1963-02-25 | 1965-11-09 | Parker Hannifin Corp | Spool valve assembly |
DE2559029A1 (de) * | 1975-12-29 | 1977-07-07 | Heilmeier & Weinlein | Bremsventil |
DE3048746A1 (de) * | 1980-12-23 | 1982-07-22 | Robert Bosch Gmbh, 7000 Stuttgart | Hydraulikanlage |
DE3305282A1 (de) * | 1982-02-18 | 1983-08-25 | Atlas Copco AB, Nacka | Lasthalteventil oder overcenterventil fuer hydraulische anlagen |
EP0466582A1 (de) * | 1990-07-13 | 1992-01-15 | Kabushiki Kaisha Kosmek | Hydraulische Schaltung zum Heben und Senken und Ventilblock für diese Schaltung |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1063431A1 (de) * | 1999-06-24 | 2000-12-27 | HEILMEIER & WEINLEIN Fabrik für Oel-Hydraulik GmbH & Co. KG | Hydraulisches Lasthalteventil |
EP2280179A3 (de) * | 2009-07-27 | 2013-11-13 | Robert Bosch GmbH | Wegeventilanordnung |
WO2013043137A1 (en) * | 2011-09-23 | 2013-03-28 | Hema Endüstri Anonim Şirketi | Hydraulic lift control system |
Also Published As
Publication number | Publication date |
---|---|
EP0816691A3 (de) | 1999-03-17 |
DE59708982D1 (de) | 2003-01-30 |
DE19627306A1 (de) | 1998-01-08 |
EP0816691B1 (de) | 2002-12-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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